Bottle bottom



FIG. 1 is a front view of a bottle bottom showing our design, the back view being a mirror image thereof;

FIG. 2 is a side view of the bottle, the opposite side being a mirror image thereof;

FIG. 3 is a bottom view of the bottle; and,

FIG. 4 is a bottom perspective view of the bottle. 

CLAIM The ornamental design for a bottle bottom, as shown and described. 